*Atmospheric Pressure
*aka air pressure*Caused by*Units
*14.7 psi*Why aren’t we crushed?*Air pushing out*Used to it
*Decreases with altitude/elevation
*Wind – What is it?*Air moves from high
pressure to low pressure*Wind*Larger pressure
differences = stronger winds
*Named for direction*Wind chill*What temp. feels like to us*Humans only
*Cause*Related to dangerousness
of wind and cold temp.*Frostbite*Hypothermia
*Local Wind*Land warms/cools faster*Hot air rises*Lower pressure over land
*Breeze from ocean (high to low pressure)*Cools the land
*Opposite at night
*Chinook Winds*What?*Warm winter winds*Dramatic temperature changes
*Where?*Mountains*Moist air
*How?*Clouds formed*Heat released
*Warmer air than without clouds*Red belt
*Changing Weather -
Air Masses*Similar temp. and humidity*Air that has stayed in a place*Quickly change because they move
*Named for where they form*Maritime vs. Continental*Tropical vs. Polar
*Daily Review #3
3. What is wind chill and why is it important to humans?
4. What creates wind?5. How are Chinook winds created?6. How can the wind be a benefit to
you when you live on the ocean shoreline?
7. A maritime tropical air mass exists over Colorado today, what would the air be like?
*Fronts*Air masses don’t mix*Front = boundary
between them*What happens?*Warm, less dense
air moves up*Cold, more dense
air sinks
*Types*Cold*Warm*Stationary*Occluded
*Type of cloud can tell you what type of front
*Tornadoes*Form in severe thunderstorms*Wind at different altitudes is
different speeds*Creates swirling winds*Eventually become vertical
*Swirling cloud reaches ground = tornado*Not on ground for long*Extremely low pressure*Winds 100-400 mph*Not well understood
*Daily Review #4
8.Describe how warm, cold, stationary and occluded fronts are different.
9.Explain how a tornado is formed.
10. Where would you probably not find tornadoes and why?
*Global Wind*Unequal heating at different
latitudes*Equator (lower latitudes)*Warmer air*Rises, lower pressure*Moves towards poles* Sinks when cools, higher pressure
*Convection cells* Patterns of moving air and high/low
pressure*Create areas of high and low winds
* Jet stream*High speed wind*Upper troposphere, lower
stratosphere*No consistent path* Effect weather patterns
*Coriolis Effect*Wind moves in a straight line*Earth’s rotation*Causes appearance of curving*Northern Hemisphere = clockwise (right)*Southern Hemisphere = counter-clockwise (left)
*Cyclones*Large weather systems* Impacted by Coriolis
effect*Cyclone*Low pressure*Pulls air in and
upward*Produces storms
*Anti-cyclone*High pressure*Air moves out and
downward*Clear skies
*Hurricanes*Winds at least 74 mph*Form over tropics*Warm, moist air forms
clouds*Rotating*More water evaporates*Creates low pressure “eye”*Lacks wind
*Gets larger with more evaporation
*Loses energy once it hits land*No more “fuel”
*Cyclones, typhoons, hurricanes
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